At the Beginning of the Solar System's History, a Ready

question 33

Multiple Choice

At the beginning of the solar system's history, a ready supply of proto-planets or mini-planets crashed into the developing planets and each other - something astronomers call the "era of giant impacts." How long do astronomers estimate this era lasted?

• A) only a few dozen years - it was over very quickly
• B) about 100 million years (0.1 billion)
• C) about two billion years
• D) about four billion years (it only ended about half a billion years ago)
• E) that era is not finished yet - giant impacts are still happening all over the solar system

---

Definitions:

Management Support

The backing or assistance provided by managers and leaders to facilitate the achievement of organizational goals.

Abundance Of Resources

A situation where there is more than enough of various resources, such as time, money, and materials, available for use.

ISD Model

A process framework for developing educational and training programs in a consistent and reliable manner, focusing on aligning learning objectives with outcomes.

Start Of Training

The initial phase or moment when a training program begins, often involving introductions, goals overview, and engagement of participants.